grammar - Verb do + verb to be + ing form

What are the correct tenses to use in the following sentence between gerund and infinitive?

What I do at this point is ____ home and _____ dinner.

Should I write:

• What I do at this point is going home and having dinner


• What I do at this point is go home and have dinner


• What I do at this point is going home and have dinner


• What I do at this point is go home and having dinner

If not clear enough, the specific concern of the question is: after the form "What I do at this point is..." what is the correct tense to use, gerund or infinitive? And then in the following "and" clause, what is the correct tense to use, gerund or infinitive?

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Other references, more fitting: