Having been through various charismatic and Pentecostal traditions and the spirituality on my own church The Orthodox Church, I feel I can confidently say three things.
First, the deposit of faith, the Revelation that God has given us and His means of speaking with us are still here. Certain spiritual phenomenon during Pentecost were for a specific purpose or time but not all of them were like that.
Second, there is an important aspect and spiritual attitude of spiritual skepticism, discernment, and vigilance at all times. Not just to try to examine what signs to look for in the gifts themselves but also to discern what is truly in our own hearts. More on this later.
Third, we must remember that even when God deems it fit to grant someone a spiritual gift, it is not theirs to do as they please. True gifts of the spirit are not open to interpretation, to be used outside of Gods intented purpose, nor should they be providing "new" revelations. The mystery of the fullness of God's revelation to us is infinitely deep in of itself. There is so much to sink our teeth into that continuing or additional ones should not be required at all.
I have seen and experienced some things that were genuinely miraculous, but for each of those i have seen many others that could be chalked up to power of suggestion, psychosomatic phenomena and so forth, and others still I would say without a doubt were outright demonic. Both of the false types can be outright devastating to one's faith.
The main thing that will help is having a proper attitude and respect for spiritual gifts and the powers that can provide them. First thing is not to fancy ourselves to be more spiritual than we really are and that requires humility above all else. Pride both in ourselves and as a fruit of any alleged gift is the very first sign of suspicion.
Also, we should not have an attitude of seeking gifts or spiritual experiences, even as a means to an end. Spiritual gifts do not make a man holy, powerful a sign as they may be, only repentance, holy living, and growing in the grace of God does. God may bless someone insofar as He wills. However, absence of gifts is not a sign of an absence of a relationship with God, and their presence does not mean that somebody has one either. God may provide them as He sees fit and insofar as we are able to handle them, or, maybe He won't.
If you read most of 1 Corinthians with this in mind, you see the overall jist is a somewhat de-emphasis on the importance of certain gifts, specifically tongues and prophecy. Orderly worship, church discipline, respect for the spirits of the angels, good living, and the respect for the mystery of holy Communion take center stage in that epistle.
For us in the Orthodox Church we also look at various spiritual experiences, both good and bad, throughout the centuries as a sort of additional data repository we can query any new phenomenon against. Is it 100% foolproof, no, anyone can still be deceived, but it does provide an additional safeguard.
It is something I bring up because for us manifestations of those who have acquired the gifts of the spirit look radically different than quite a few of the modern day versions of spiritual gifts we are accustomed to hearing. It is certainly worth a look to see how the two compare...
This is from a conversation in 19th century Russia between a man named Nicholas Motovilov and Orthodox St. Seraphim of Sarov. St. Seraphim does a wonderful scriptural exegesis to demonstrate what the fruits of the spirit look like and it is a very edifying read.
“If the history of the 20th Century proved anything, it proved that however bad things were, human ingenuity could usually find a way to make them worse.” - Theodore Dalrymple