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If your country is visa free for Thailand you can enter and go back again, keep in mind that if you do that a lot of times may they start to ask you questions about your travel plan.
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Land borders:
Visa Exempt (VE) entries for certain nationals are limited to twice per calendar year for nationals that qualify for VE. Malaysians are exempted from this rule.
Airport borders,
No official limit. There was an alert that would go off after 6 VE entries within a 12 month period. But unofficially, that limit has seemed to drop to 2-3 entries since 2019, especially if you have a "history" of using VEs/SETVs over the past 12-24 months to stay.