how to optimize taxes on digital product sales?

i made a significant amount from selling digital products this past year (1099-k from stripe) in addition to my w2 job. is there anything i can do to optimize the amount of taxes i owe? claude was telling me about opening an SEP-IRA, but i already have a maxed out roth. does that affect the SEP-IRA, and if not, how should i contribute to it?

otherwise, are there other things i can do? thanks!