Dear Sir/Mam,
I have been in this industry for 2 years and such jobs are my daily practice. I can assure you that if you work with me once, you will always work with me for these kind of projects.
Methods:-
1) Optimize your ads according to your forum layout.
2) Use A/B testing for best performing ad version.
3) Stop unwanted ads to get your ad sense space.
4) Use custom channels to gather niche advertisers for your ads.
If you like my proposal, then send me a message for more info.
Best Regards
Gaurav Sharma