Add yourself to clients systems : Cloudflare, Stripe
I use Google Chrome as my primary browser and so the everyday logins are for my personal or business accounts. These include Gmail, MailChimp, Stripe, etc.
When working with client accounts I don’t want to logout of my accounts to then login to the client accounts. So I use Firefox for all client logins to have this clear seperation. Taking this one step further I Firefox has container tabs which allows very easy multiple logins per browser.
Working with multiple customers
Use Firefox Container Tabs, 1 for each client
Use lastpass or 1Password