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Mega backdoor Roth is capped at $35000 (highly unusual to be able to fully fund this amount, since it requires a 401(k) that is structured to support it).

Backdoor Roth / direct contribution is capped at $5500 a year.

So in a perfectly optimal world of all the right situations, you could put up to $40,500/yr into a Roth IRA.

Currently, I'm getting about $15k into my Roth IRA annually (got lucky with the properly structured 401(k) plan at work) and I feel pretty fortunate about that.