Do i have to market my theme outside themeforest or my good theme design will help in good sales?

[unvab]

@Spectacular_Pixels

good amount of sales like these new multipurpose wordpress themes do

If you aren’t developing a Multi-Purpose WordPress theme, then you just will not see the same amount of sales of your own WordPress theme. This is logical.

Anyway, the traffic of buyers here is far from the same as it was 3 years ago or later, so I recommend that you do not wait for the buyers to find you. Help them.