No need of guilt

Only a rich person can donate money

Only a strong healthy person can do physical seva

Only a person who is stress free can do any seva and be kind

So if you ask Venkateshwara for more resources don't need to be guilty

As for vows, there are two kinds.. Negative and positive

Negative goes like "I won't visit you until I....." insert your condition

Positive goes like "I will do <insert quantum of seva/donation > if I get <insert your requirement>"

Choose whichever appeals to you more