So i was holding coin going to a year now. And i left crypto for a while on getting back, i couldn’t access my wallet because the team did an upgrade and old wallet was washed out. ~snip~
What coin do you mean, mate?
If you plan for long investment or holding for a long time, I suggest you choose top coins for the safety reason.
Anyway, even if you don't trade or invest at all, you must still keep on monitoring your coins, including the updated info on their official telegram groups. So, if there is an upgrade on the wallet or another issue, you will know it soon.