However, note that 33 ACT has concordance with 1450 to 1480 SAT, according to https://www.act.org/content/dam/act/unsecured/documents/ACT-SAT-Concordance-Tables.pdf . Raising it to 34 would merely equal the 1520 SAT score (which is at the top of the 34 ACT range), so you would need to raise it to 35 or higher to beat your SAT score.
Raising your ACT to 35 would be easier if your current 33 is really 33.25 than if it is really 32.5 (the average of section scores).