Lost another job because I forgot to follow up what do you guys actually use?

Hi all, I just did a quote for a bathroom renovation project last week. Client said they will get back to me.

Now they have ghosted me and I found out later they went with someone else. Feels like I am losing jobs not because of price but because I am bad at following up.

What do you guys actually use? CRM, spreadsheet, phone reminders, or just memory? Curious what's working for small shops.