I'll support Mugsgame in his view, he's one of the most frequent posters here, has some battles over his views, but he's dead honest.
If you think of coming back to trading again then stop, see what went wrong with the bad ones(your liquidity not included)Did the one you backed, start acting the king canute in the parade ring? Did the jockey have to dismount to even get the horse to the start line? If you can spot your previous things that should have been red flags, then you could have cut your losses earlier and drawn a line under it. Next race.
There's plenty of phrases thrown about regarding trading and business in general, the main one I pay attention to is "The first way to make a profit is reduce your losses, bit by bit, then the profits come"
Or you could go by the route of my beloved Grandads train of thought - "Mickeys Diamond in the 3.10 Why? We used to have a supervisor in the mill back in about 1965 called Mickey, he would never give any overtime, if you got it, then it was like coal out of his arse, a fuckin diamond! Mickeys Diamond will win that." 25/1 kinda thing on a regular basis. All I could do was shake my head like an annoyed Scotsman....and I'm from Dublin
