Keep your calm.
No tax office in the world has time to look into all
CRS information they get. If a tax office gets reports of 5 million accounts held abroad by their residents, you can bet they will never under any circumstance investigate more than 10% of accounts. Naturally, they will set their own criteria of what is worth a closer look.
Do not take this for granted, but if you live in a big country, having your tax office contact you about your 25,000 euros/pounds held abroad is EXTREMELY unlikely. So getting reported may or may not matter. If you live in a country of 500,000 residents, your chances of getting investigated will be much higher even on low account balances.
Flag theory is still relevant despite CRS. Get reported on 25K to country A, then get reported on 50K to country B and so on. If you have residency documents from many countries, you can spread your
cash around and mitigate tax risk.