Are you looking for inspirational blogs? I do not guarantee that all of them would be fully helpful to you, but at least a few of them. I try to review them regularly.
Here you are, in alphabetical order.

Adatis https://adatis.co.uk/blog/

Advancing Analytics https://www.advancinganalytics.co.uk/blog

Andrew Pruski (DBA From The Cold) https://dbafromthecold.com/

Bartek Ratajczyk http://blog.bartekr.net/

SQL with Bert (Bert Wagner’s blog) https://bertwagner.com/

Brent Ozar Unlimited https://www.brentozar.com/

Cathrine Wilhelmsen https://www.cathrinewilhelmsen.net/

Chris Webb’s BI Blog https://blog.crossjoin.co.uk/

Every Byte Counts https://sqlbek.wordpress.com/

Ginger Grant http://www.desertislesql.com/wordpress1/

Greg Low’s Blog https://blog.greglow.com/

James Serra’s Blog http://www.jamesserra.com/

Kendra Little’s Blog https://sqlworkbooks.com/

Machine Learning Blog https://blogs.technet.microsoft.com/machinelearning/

Melissa Coates’ Blog https://www.sqlchick.com/entries/

Microsoft Power BI Blog | Microsoft Power BI
https://powerbi.microsoft.com/en-us/blog/

Microsoft R Server Tiger Team https://blogs.msdn.microsoft.com/microsoftrservertigerteam/

MS Azure > Business Intelligence
https://azure.microsoft.com/en-us/blog/topics/business-intelligence/

MS Azure > Data Warehouse
https://azure.microsoft.com/en-us/blog/topics/data-warehouse/

MS Azure > Database
https://azure.microsoft.com/en-us/blog/topics/database/

Ms SQL Girl http://www.mssqlgirl.com/

MSSQL Tiger Team
https://techcommunity.microsoft.com/t5/sql-server-blog/bg-p/SQLServer/label-name/SQLServerTiger

Niko Neugebauer http://www.nikoport.com/

Paul Andrew https://mrpaulandrew.com/

Paul White Blog https://sql.kiwi/

Pinal Dave https://blog.sqlauthority.com/

Prathy’s Blog http://prathy.com/

Purple Frog Systems https://www.purplefrogsystems.com/blog/

RADACAD http://radacad.com/

Redgate University
https://www.red-gate.com/hub/university/

Rob Richardson https://robrich.org/

Rob Sewell (SQL DBA with A Beard) https://sqldbawithabeard.com/

SentryOne Team Blog https://blogs.sentryone.com/

Spaghetti DBA https://spaghettidba.com/

SQL Hammer https://www.sqlhammer.com/

SqlHints.com http://sqlhints.com/

SQLpassion http://www.sqlpassion.at/

Strate SQL https://jasonstrate.com/

TechTacoFriday https://www.techtacofriday.com/

Thomas LaRock https://thomaslarock.com/

Tim Mitchell https://www.timmitchell.net/

Todd McDermid’s Blog (SSIS) http://toddmcdermid.blogspot.com/

Do you know any other interesting blogs? Please, let me know - leave a comment.

Cheers,
Kamil