I am assuming you are asking this question, because you feel that at the moment you cannot practice all yamas and niyamas. In that case, focus on tapas, svadhyaya and ishvara pranidhana. This is what Patanjali calls kriya yoga.
None of the yamas and niyamas are in contradiction with (gaudiya) vaishnavism. Just don't read about them from dubious sources like Himalayan academy.
To give an example of what you can do in alignment with your Vaishnava path.
tapas = follow ekadashi vrata with complete fasting
svadhyaya = do japa of the Maha mantra (Hare Krishna Mantra) and study the scriptures
Ishvara Pranidhana = worship and meditate on Krishna
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