My best suggestion to you is to first establish yourself on a platform for awhile, as this will generally remove many of the restrictions that newbs face like holding onto $, purchase limits, etc. Think of it like a regular bank that you are establishing a relationship with. The more they know you and seeing you not be a jackass, the easier life becomes.
Second, for all purchases make sure you use a 3rd party, non-custodial wallet to send your crypto. Don't just send it from the exchange you are using, cash app, or whatever. This is another potential problem area that is easy to avoid.
It might seem daunting at first, but dealing in Crypto is pretty much a requirement in this lifestyle nowadays, so spending the time to feel confident is a wise investment.